iru1120 International Rectifier Corp., iru1120 Datasheet - Page 3

• Manufacturer Part Number: iru1120
• Description: 2a Low Dropout Positive Adjustable Regulator -
• Manufacturer: International Rectifier Corp.

PARAMETER
Dropout Voltage
Dropout Voltage
Current Limit
Minimum Load Current
Thermal Regulation
Ripple Rejection
Temperature Stability
Long Term Stability
RMS Output Noise
Vcc Quiescent Current
Note 1: Low duty cycle pulse testing with Kelvin con-
nections is required in order to maintain accurate data.
Note 2: Dropout voltage is defined as the minimum dif-
ferential voltage between V
tain regulation at V
voltage drops 1% below its nominal value.
PIN DESCRIPTIONS
PIN #
Rev. 1.3
08/20/02
1
2
3
4
5
PIN SYMBOL
V
V
Gnd
V
V
CTRL
OUT
ADJ
IN
(Vcc to Output)
OUT
. It is measured when the output
The control input pin of the regulator. This pin is connected to the 5V supply to provide
base current for the pass transistor of the regulator. This allows the regulator to have very
low dropout voltage, enabling use with low values of V
is connected from this pin to V
The power input pin of the regulator. A minimum of input capacitance must be connected
from this pin to ground to insure that the input voltage does not sag below the minimum
dropout voltage during the load transient response. This pin must always be higher than
the V
regulate properly.
This pin is connected with ground. It is also the tab of the package.
The output of the regulator. A minimum of output capacitance must be connected from
this pin to ground to insure stability.
A resistor divider from this pin to the V
application section for divider setting recommendations and a circuit example.
PIN DESCRIPTION
IN
and V
OUT
Reg
Stab
Stab
SYM
I
PSRR
pin by the amount of dropout voltage (see data sheet) in order for the device to
V
V
O(min)
OUT
V
I
I
THERM
DO5
DO6
OL
Q1
TEMP
LONG
N
required to main-
Note 2, Io=1.5A, V
following:
Note 2, Io=2A, V
following:
DV
Note 3, 5
Note 5, 30ms pulse, Io=I
Note 5, 100Hz<f<100KHz, Io=20mA
Note 4, 5, Io=10mA
Note 5
Note 5, 10Hz<f<10KHz
Io=0mA
O1
=10% Below Regulation
TEST CONDITION
www.irf.com
IN
-408C< T
-408C< T
CTRL
Note 3: Minimum load current is defined as the mini-
mum current required at the output in order for the out-
put voltage to maintain regulation.
Note 4: Temperature stability is the change in output
from nominal over the operating temperature range.
Note 5: Guaranteed by design, but not tested in produc-
tion.
to ensure stability.
08C< T
08C< T
CTRL
=V
=V
OUT
IN
J
J
FL
<1258C
<1258C
for the
IN
J
J
<1258C
<1258C
pin and to ground sets the output voltage. See
for the
IN
. A 1mF high frequency capacitor
MIN
2.3
0.003
1.35
1.44
TYP
1.2
1.3
0.1
0.5
0.3
32
3
1
1
IRU1120
MAX
1.35
1.5
4
5
3
UNITS
%/W
%Vo
%Vo
%Vo
mA
mA
dB
V
V
A
3